JPH0361057A - Thermal transfer recorder - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an irregular recording medium feeding or the like to reproduce a good image by controlling a recording medium feed force in accordance with the number of black pixels in a recording image. CONSTITUTION:The adhesion between recording paper and an ink sheet is increased with the increase of the number of black dots to be recorded at that time. Therefore, when data for one line is transmitted to a shift register 130 in a thermal head 13, the number of dots (bits) with a value '1' is counted. When a value (m) obtained as the result of the counting is judged to be a predetermined number or more, the increase of the flow of an electric current is instructed by an electric current control circuit 200. As a result, a recording paper feed motor 24 is driven with a larger drive force, and a step-out and an irregular recording paper feeding can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention transfers ink from an ink sheet to a recording medium,
The present invention relates to a thermal transfer recording device that records an image on a recording medium.

[Prior Art] Generally, thermal transfer printers use an ink sheet in which heat-melting (or heat-sublimating, etc.) ink is applied to a base film, and a thermal head selectively heats the ink sheet in response to image signals. Then, images are recorded by transferring the molten (or sublimated, etc.) ink onto recording paper. Generally, this ink sheet is one in which the ink is completely transferred to the recording paper by one image recording (a so-called one-time sheet), so after recording one character or one line,
It was necessary to transport the ink sheet by an amount corresponding to the recorded length and to surely bring the unused portion of the ink sheet to the next recording position. For this reason, the amount of ink sheets used increases, and the running cost of thermal transfer printers tends to be higher than that of ordinary thermal printers that record on thermal paper.

In order to solve these problems, Japanese Unexamined Patent Publication No. 57-83
471, Japanese Patent Application Laid-Open No. 58-201686, and Japanese Patent Publication No. 62-58917, thermal transfer printers have been proposed in which a recording paper and an ink sheet are conveyed at different speeds.

The present invention is a further development of the invention described in the above publication.

[Problems to be Solved by the Invention] An ink sheet (so-called multi-print sheet) that can record images a plurality of times (n) is known, and if this ink sheet is used, a recording length L can be continuously recorded. When performing image recording, the conveyance length of the ink sheet conveyed after each image recording or during image recording is set to be smaller than the length L ((L/n
: n>1) and can be recorded. This results in
The ink sheet usage efficiency is n times higher than that of the conventional method, and it is expected that the running costs of thermal transfer printers will be reduced. below,
This recording method is called multiprint.

In the case of multi-printing using such an ink sheet, the ink in the ink layer of the ink sheet is heated n times. At each heating, the ink layer melts (
Transfer to recording paper is performed by generating a shearing force between the ink that has been (sublimated, etc.) and the ink that has not been melted (or sublimated, etc.).

For this reason, for example, if the time between recording one line and recording the next line increases and the temperature of the ink decreases, the difference between the ink that has been melted (or sublimated, etc.) and the ink that has not been melted (or sublimated, etc.) There is a problem in that the shearing force increases, making it difficult to separate the ink sheet and recording paper.

This problem occurs particularly when there is a lot of black information in one line of recorded data.

Normally, the recording paper and ink sheet are separated by the driving force of the motor that transports them, but in this way, the recording paper and ink sheet adhere with a large force, which exceeds the torque of the motor. If so, there is a risk that the motor will step out of synchronization. Alternatively, even if step-out does not occur, there is a risk that a good image cannot be reproduced due to uneven feeding caused by the recording paper being not conveyed by an appropriate amount.

The present invention was created in view of this problem, and by controlling the energy given to the recording medium conveyance system depending on the number of black pixels to be recorded, it is possible to eliminate unevenness in recording paper feeding and reproduce good images. It is an object of the present invention to provide a thermal transfer recording device that can be smoothed.

[Means for Solving the Problems] In order to achieve the above object, the thermal transfer recording device of the present invention has the following configuration. That is, it is a thermal transfer recording device that transfers ink from an ink sheet to a recording medium to record an image on the recording medium, and includes an ink sheet conveying means for conveying the ink sheet, and a recording medium for conveying the recording medium. a conveyance means; a recording means for recording an image on the recording medium by acting on the ink sheet; a counting means for counting the number of black pixels recorded by the recording means; and control means for controlling the conveying force of the recording medium conveying means.

[Function] In the thermal transfer recording apparatus of the present invention, when the ink sheet conveying means and the recording medium conveying means try to convey the ink sheet and the recording medium in preparation for recording the next image, the black pixels counted by the coefficient means The conveying force of the recording medium conveying means is controlled according to the number of recording medium conveying means.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Description of facsimile device (Figs. 1 to 4)> Figs. 1 to 4 are diagrams showing an example in which a thermal transfer printer using an embodiment of the present invention is applied to a facsimile device. 2 is a block diagram showing a schematic configuration of the facsimile device, FIG. 3 is a side sectional view of the facsimile device, and FIG. FIG. 3 is a diagram showing a conveyance mechanism for recording paper and an ink sheet.

First, the schematic structure of the facsimile machine will be explained based on FIG.

In the figure, reference numeral 100 denotes a reading unit that photoelectrically reads an original and outputs it as a digital image signal to a control unit 101, and is equipped with an original transport morph, a CCD image sensor, and the like. Next, the configuration of this control section 101 will be explained. A line memory 110 stores image data for each line of image data, and when transmitting or copying a document, one line of image data from the reading section 100 is stored.
When image data is received, line data of the decoded received image data is stored. Image formation is then performed by outputting the stored data to the recording unit 102. Reference numeral 111 denotes an encoding/decoding unit that encodes image information to be transmitted by MH encoding or the like, and decodes received encoded image data to convert it into image data. Further, 112 is a buffer memory that stores encoded image data that is transmitted or received. Each part of the control unit 101 is controlled by a CPU 113 such as a microprocessor. In addition to the CPU 113, the control unit 101 includes a ROM 114 that stores control programs and various data for the CPU 113, and a CPU.
It is equipped with a RAM 115 for temporarily storing various data as a work area of 113.

A recording unit 102 includes a thermal line head and records an image on recording paper using a thermal transfer recording method. This configuration will be described in detail later with reference to FIG. Reference numeral 103 is an operation unit including various function instruction keys such as starting sending and keys for inputting a telephone number, and reference numeral 103a is a switch for instructing the 140 types of ink sheets to be used.When the switch 103a is on, multi-print ink sheets are used. , when off, it indicates that a normal ink sheet is installed. 10
4 is a display section that is usually provided adjacent to the operation section 103 and displays various functions, the status of the device, and the like. 10
5 is a power supply unit for supplying power to the entire device. Further, 106 is a modem (modulator/demodulator), and 107 is a network control unit (
NCU), 108 is a telephone.

Next, the configuration of the recording section 102 will be explained in detail with reference to FIG. Note that parts common to FIG. 2 are indicated by the same figure numbers.

In the figure, 10 indicates recording paper 11, which is plain paper, as a core 10.
A is a roll of paper wound into a roll. This roll paper 10 is rotatably housed in the apparatus so that the recording paper 1 can be supplied to the thermal head section 13 by rotation of the platen roller 12 in the direction of the arrow. Note that 10b is a roll paper loading section, in which the roll paper 10 is removably loaded. Furthermore, 12 is a platen roller which conveys the recording paper 11 in the direction indicated by the arrow and presses the ink sheet 14 and the recording paper 11 between it and the heating element 132 of the thermal head 3. Thermal head 13
As the platen roller 12 further rotates, the recording paper 11 on which the image has been recorded due to the heat generated by the
(16a, 16b) direction, and when the image recording for one page is completed, the cutter l5 (15a, 15b) is engaged and cut into pages.

17 is an ink sheet supply roll that winds the ink sheet 14, and 18 is an ink sheet take-up roll, which is driven by an ink sheet conveyance motor to be described later and winds up the ink sheet 14 in the direction of arrow a. . In addition,
The ink sheet supply roll 7 and the ink sheet take-up roll 18 are connected to an ink sheet loading section 70 in the main body of the apparatus.
It is removably loaded. Furthermore, 19 is a sensor for detecting the remaining amount of the ink sheet 14 and the conveying speed of the ink sheet 14. Further, 20 is an ink sheet sensor for detecting the presence or absence of the ink sheet 14;
is a spring that presses the thermal head 13 against the platen roller 12 via the recording paper 11 and the ink sheet 14. Further, 22 is a recording paper sensor for detecting the presence or absence of recording paper.

Next, the configuration of the reading section 100 will be explained.

In the figure, 30 is a light source that illuminates the original 32;
The light reflected by the CCD sensor 31 is input to the CCD sensor 31 through an optical system (mirrors 50, 51, and lens 52), and is converted into an electrical signal. The document 32 is conveyed by conveyance rollers 53, 54, 55, and 56 driven by a document conveyance motor (not shown).
Accordingly, the document 32 is transported in accordance with the reading speed of the document 32.

Note that 57 is a document loading table, and the plurality of documents 32 stacked on this loading table 57 are separated into sheets one by one by the cooperation of the conveying roller 54 and the pressing separation piece 58, and then transferred to the reading section 100. transported to.

A control board 41 constitutes the main part of the control section 101, and various control signals are outputted from this control board 41 to each part of the apparatus. Further, 106 is a modem board unit, 107 is N
This is a CU board unit.

Furthermore, FIG. 4 is a diagram showing details of the conveyance mechanism for the ink sheet 14 and the recording paper 11.

In the figure, 24 rotationally drives the platen roller 12;
This is a recording paper transport motor for transporting the recording paper 11 in the direction indicated by the arrow, which is opposite to the direction indicated by the arrow a. Further, 25 is an ink sheet transport motor for transporting the ink sheets 1 to 14 in the direction of arrow a by means of a capstan roller 71 and a pinch roller 72. Further, 26.27 is a transmission gear that transmits the rotation of the recording paper conveyance motor 24 to the platen roller 12, and 73.74 is an ink sheet conveyance motor 25.
This is a transmission gear that transmits the rotation of the capstan roller 71 to the capstan roller 71. Further, 75 is a slip clutch unit.

Here, the ratio of gears 74 and 75 is set so that the length of the ink sheet 14 wound on the take-up roll 18 by the rotation of the gear 75a is longer than the length of the ink sheet conveyed by the capstan roller 7. By keeping
The ink sheet 14 conveyed by the capstan roller 71 is reliably wound onto the take-up roll 18. and,
An amount corresponding to the difference between the amount of the ink sheet 14 taken up by the take-up roll 18 and the amount of the ink sheet 14 fed by the capstan roller 71 is transferred to the slip clutch unit 7.
Absorbed in 5. This makes it possible to suppress fluctuations in the transport speed (amount) of the ink sheet 14 due to fluctuations in the winding diameter of the winding roll 18.

FIG. 1 shows a control unit 1 in a facsimile machine according to an embodiment.
01 and the recording unit 102, and parts common to other drawings are indicated by the same figure number.

The thermal head 13 is a line head. The thermal head 13 includes a shift register 130 for inputting one line of serial recording data and a shift clock 43 from a control section 191, and a latch circuit 131.1 for latching data in the shift register 130 using a latch signal 44. Heating element 13 consisting of a line of heating resistors
2. Here, the heating resistor 132 is 1321
It is divided into m blocks indicated by 132-m and driven. Further, 133 is a temperature sensor attached to the thermal head 13 for detecting the temperature of the thermal head]3. The output signal 42 of this temperature sensor 133 is A/D converted in the control unit 101 and then
It is input to tJ113. As a result, the CPU 113 detects the temperature of the thermal head 13 and changes the pulse width of the strobe signal 47 in accordance with the temperature, or changes the driving voltage of the thermal head 13 in accordance with the characteristics of the ink sheet 14. The energy applied to the thermal head 13 is changed accordingly.

Note that the type (characteristics) of the ink sheet 14 may be determined by detecting the switch 103a of the operation section 103 described above or a mark printed on the ink sheet 14, or by detecting a mark printed on the ink sheet 14. The determination may be performed by identifying marks, notches, protrusions, etc. attached.

Reference numeral 46 denotes a drive circuit that inputs a drive signal for the thermal head 13 from the control section 101 and outputs a strobe signal 47 for driving the thermal head 13 in units of blocks. Note that this drive circuit 46 changes the voltage output to the power supply line 45 that supplies current to the heating element 132 of the thermal head 13 in accordance with instructions from the control unit 101 to control the thermal head 13.
The applied energy of can be changed. Reference numeral 36 denotes a drive circuit that engages and drives the cutter 15, and includes a cutter drive motor and the like. 39 is a paper ejection motor that rotationally drives the paper ejection roller 16.

35, 31, and 32 are the corresponding paper ejection motors 39
, a driver circuit that rotationally drives the recording paper conveyance motor 24 and the ink sheet conveyance motor 25. Note that these paper ejection motor 39, recording paper conveyance motor 24, and ink sheet conveyance motor 25 are stepping motors in this embodiment, but are not limited to this, and may be, for example, DC motors. Also good.

Further, each motor is the same in that it rotates its rotating shaft by an amount corresponding to the number of pulse signals output from each driver circuit, but the recording paper conveyance motor 24 in the embodiment has a variable driving force. It is now possible to do so.

The greater the current (applied voltage) to the stepping motor, the greater its driving force. Therefore, in the embodiment, as shown in the figure, a current control circuit 200 is provided so that the current value flowing through the recording paper transport motor 24 can be changed.
The driving force of the recording paper conveyance motor 24 is controlled by the MPTJlol (.) A fixed current flows through the ink sheet conveyance motor 25 and the paper ejection motor 15.

9 Now, in such a configuration, in the embodiment, the recording paper 11
This is intended to prevent out-of-step of the recording paper transport motor 24 or uneven feeding of the recording paper, which occurs when the ink sheet 14 becomes difficult to peel off.

The adhesive force between the recording paper 11 and the ink sheet 14 is stronger as the number of black dots recorded at that time increases. Therefore, in this embodiment, when transferring one line of data to the shift register 130 in the thermal head 13, dots (bits) that are 1° are counted. Then, when it is determined that the value m obtained as a result of this counting has exceeded a predetermined number (m in the embodiment), the current control circuit 200 is instructed to flow more current. As a result, the recording paper conveyance motor 24 is driven with a larger driving force, making it possible to prevent synchronization and uneven feeding of the recording paper.

<Explanation of Recording Operation (Figures 1 to 6)> Figure 5 is a flowchart showing the recording process for one page in the facsimile machine of this embodiment, and the control program that executes this process is the control unit], 01 It is stored in the ROM 114 of. Further, FIG. 6 is a timing chart of data transfer, application of the heating resistor, and control signal of the recording paper conveyance motor in this embodiment, and the operation processing procedure of this embodiment will be explained based on these.

Note that this process is started when one line of image data to be recorded is stored in the line memory 110 and the recording operation can be started. It is assumed that the determination is made by the control unit 101 according to the following.

First, in step S1, one line of data to be recorded (stored in the line memory 110) contains one line.
Count the number m of dots (bits) that are '°'. Then, in step S2, one line of data stored in the line memory 110 is sequentially synchronized with the shift clock and transferred to the shift register 13 of the thermal head 13.
Transfer to 0. The shift register 130 sequentially shifts input data in synchronization with the shift clock, and stores data for one line in its entire area. When data for one line is output, a latch signal is output, so that the latch circuit 131 latches (latches at the rising edge) the bit data stored in the shift register 130, and causes the data to be output to the heating resistor 132. (Step S3). After this, each processor of the heating resistor 132
3. By energizing the device for a predetermined period of time, 1947 minutes of recording is performed. Thereafter, the process proceeds to step S5, where the number of dots recorded immediately before (m counted in step S1) and the reference value m are recorded. Compare with.

m<m. At this time, it is determined that the adhesive force between the recording paper 1 and the ink sheet 14 is not so strong, and the process proceeds to step S6, where the current control 200 is controlled to supply a normal current to the recording paper transport motor 24. .

On the other hand, when it is determined that m≧mo, that is, when it is determined that the recording paper conveyance motor 24 will step out or, at best, cause uneven feeding of the recording paper, the process advances to step S7. , a current control circuit 20 so that a larger current than usual can be supplied to the recording paper transport motor 24.
0 is controlled.

4 In any case, the process proceeds to step S8. here,
The ink sheet 14 is conveyed by 1/n947 minutes, and the recording paper 11 is conveyed by one line. At this time, it goes without saying that the recording paper 11 being conveyed is conveyed with a driving force based on the magnitude of the current set previously. Next, the process proceeds to step S9, where it is determined whether recording for one page has been completed, and the processes from step 81 onwards are repeated until this determination becomes 'YES'.

Now, if it is determined that the recording process for one page has been completed, the process proceeds to step SIO, and the recording paper 11 is conveyed by a predetermined amount in the direction of the paper discharge rollers 16a and 16b. and,
In step Sll, the cutters 15a and 15b are driven and engaged to cut the recording paper 11 into pages. Next step S
At step 12, the recording paper conveying motor 24 is reversely driven to return the recording paper 11 by a distance corresponding to the distance between the thermal head 13 and the cutter 15 in preparation for recording the next page.

As described above, according to this embodiment, when it is determined that the number of dots in a recorded line, that is, the number m of black dots, is large and that uneven feeding of the recording paper will occur if left as is, the recording Since the driving force of the paper conveyance motor 24 is increased, such a situation can be avoided.

<Explanation of Recording Principle (FIG. 7)> FIG. 7 is a diagram showing an image recording state when an image is recorded with the conveyance directions of the recording paper 11 and the ink sheet 14 reversed in this embodiment.

As shown, a recording paper 11 and an ink sheet 14 are held between a platen roller 12 and a thermal head 13, and the thermal head 13 is pressed against the platen roller 12 with a predetermined pressure by a spring 21. Here, the recording paper 11 is conveyed in the direction of the arrow at a speed of 2 by the rotation of the platen roller 12. On the other hand, the ink sheet 14
is transported in the direction of arrow a at a speed of 1 by the rotation of the ink sheet transport motor 25.

Now, power supply 1 is connected to heating resistor 132 of thermal head 13.
When the ink sheet 14 is energized and heated, the shaded portion 91 of the ink sheet 14 is heated. Here, 14a represents the base film of the ink sheet 14, and 14b represents the ink layer of the ink sheet 14. The ink in the ink layer 91 heated by energizing the heating resistor 132 is melted, and a portion of the ink layer 92 is transferred onto the recording paper 11 . This transferred ink layer portion 92 corresponds to approximately 1/n of the ink layer indicated by 91.

At the time of this transfer, at the boundary line 93 of the ink layer 14b,
It is necessary to generate a shearing force on the ink and transfer only the portion indicated by 92 onto the recording paper 11. However, this shearing force varies depending on the temperature of the ink layer, and the higher the temperature of the ink layer, the smaller the shearing force tends to be. Therefore,
If the heating time of the ink sheets 1 to 14 is shortened, the shearing force within the ink layer will increase, so if the relative speed between the ink sheet 14 and the recording paper 11 is increased, the ink layer to be transferred can be transferred more reliably from the ink sheet 14. It can be peeled off.

<Description of Ink Sheet (FIG. 8)> FIG. 8 is a cross-sectional view of the ink sheet used for multi-printing in this embodiment, which is composed of four layers.

First, the second layer is a base film that serves as a support for the ink sheet 14. In the case of multi-printing, 8 thermal energy is applied to the same location many times, so highly heat-resistant aromatic polyamide films and capacitor paper are advantageous, but conventional polyester films can also be used. Due to the role of the medium, the thinner these are, the more advantageous it is in terms of print quality, but from the point of view of strength, three
~8 μm is desirable.

The third layer is an ink layer containing an amount of ink that can be transferred n times onto a recording paper (recording sheet).

This component is mainly composed of resins such as EVA as an adhesive, carbon black and nigrosine dyes for coloring, carnauba wax and paraffin wax as binding materials, and is formulated to withstand use n times in the same place. has been done. This application amount is 4-8 g/m
2 is desirable, but the sensitivity and density will vary depending on the amount of application.
Can be selected arbitrarily.

The fourth layer is a top coating layer for preventing pressure transfer of the third layer ink onto the recording paper in areas where printing is not performed, and is made of transparent wax or the like. As a result, only the transparent fourth layer is pressure-transferred, and it is possible to prevent background smudges on the recording paper. The first layer is the thermal head 13
This is a heat-resistant coating layer that protects the second layer base film from heat. This is suitable for multi-printing in which thermal energy for n lives may be applied to the same location (when black information is continuous), but whether to use it or not can be selected as appropriate. It is also effective for base films with relatively low heat resistance, such as polyester films.

Note that the structure of the ink sheet 14 is not limited to this embodiment, and may be composed of, for example, a base layer and a porous ink-retaining layer containing ink provided on one side of the base layer. A heat-resistant ink layer having a microporous network structure may be provided thereon, and the ink may be contained within the ink layer. In addition, examples of the base film material include polyamide, polyethylene,
It may also be a film or paper made of polyester, polyvinyl chloride, triacetylcellulose, nylon, or the like. Furthermore, although a heat-resistant coating layer is not necessarily required,
The material may be, for example, silicone resin, epoxy resin, fluorine resin, nitrocellulose, or the like.

Furthermore, as an example of an ink sheet containing heat-sublimable ink, spacer particles made of guanamine-based resin and fluoro-based resin are placed on a base material made of polyethylene terephthalate, polyethylene naphthalate, aromatic polyamide film, etc. and an ink sheet provided with a color 4'A layer containing a dye.

Note that the heating method in the thermal transfer printer is not limited to the thermal head method using the above-mentioned thermal head, and for example, an energization method or a laser transfer method may be used.

In addition, although this embodiment has been explained using an example of using a thermal line head, the present invention is not limited to this.
It may also be a so-called serial type thermal transfer printer. Furthermore, although the present embodiment has been described in the case of multi-printing, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to the case of ordinary thermal transfer recording using a one-time sheet.

Further, in the above-described embodiments, the thermal transfer printer is applied to a facsimile machine, but the present invention is not limited to this. For example, the thermal transfer recording device of the present invention can be applied to a word processor, a typewriter, a copying machine, etc. .

Further, the recording medium is not limited to recording paper, and may include cloth, plastic sheets, etc. as long as it is made of a material that allows ink transfer. In addition, the ink sheet is not limited to the roll configuration shown in the embodiments, and for example, a so-called ink sheet in which an ink sheet that can be attached to and detached from the main body of the recording apparatus is built into a housing, and the housing is attached to and detached from the main body of the recording apparatus. It may be of a cassette type or the like.

As explained above, according to this embodiment, since the driving force of the recording paper transport motor is controlled by the number of black pixels in the recorded image, it is possible to prevent image quality deterioration due to uneven feeding of the recording paper. Become.

Furthermore, in this embodiment, the current applied to the recording paper transport motor 24 has been explained in two stages, but it goes without saying that the current may be controlled in other stages depending on the number (or ratio) of black pixels of the line to be recorded. .

Further, in the embodiment, the current was controlled only by the number of recorded black pixels, but since the state of sticking between the ink sheet 14 and the recording paper 11 varies depending on the ambient temperature, data from the temperature sensor 133 is also taken into consideration. It may also be controlled by

For example, m to be compared depending on the obtained temperature. It is possible to change the

Furthermore, when recording is performed while the recording paper is continuously moving, sticking is less likely to occur, so it is desirable not to increase the current value in such a case. In other words, it is also effective to perform the above-mentioned processing when the recording cycle exceeds a certain value.

In the embodiment, an example in which the recording medium and the ink sheet are conveyed in opposite directions has been described, but the present invention may be applied to a conventional case in which the recording medium and the ink sheet are conveyed in the same direction.

Further, the present invention includes a case where the conveying force of the recording medium conveying means is controlled at least according to the number of black pixels recorded immediately before.
Of course, this also includes a case where the conveying force of the recording medium conveying means is controlled in accordance with the number of black pixels to be recorded immediately after.

[Effects of the Invention] As explained above, according to the present invention, since the force for conveying the recording medium is controlled according to the number of black pixels of the recorded image, unevenness in the conveyance of the recording medium does not occur, and a good result is obtained. This makes it possible to reproduce images that are accurate.

In the embodiment, an example in which the recording medium and the ink sheet are conveyed in opposite directions has been described, but the present invention may be applied to a conventional case in which the recording medium and the ink sheet are conveyed in the same direction.

4,

[Brief explanation of drawings]

Fig. 1 is a diagram showing the electrical connection between the control section and the recording section of the embodiment, Fig. 2 is a block diagram showing the schematic configuration of the facsimile machine of the embodiment, and Fig. 3 is a mechanical section of the facsimile machine of the embodiment. FIG. 4 is a diagram showing the structure of the ink sheet and recording paper conveyance system, FIG. 5 is a flowchart showing the recording process of this embodiment, and FIG. 6 is a diagram showing the quimming in the recording process of this embodiment. FIG. 7 is a diagram showing the state of the recording paper and ink sheet during recording in this embodiment, and FIG. 8 is a sectional view of the multi-ink sheet I used in this embodiment. In the figure, 10...rolled recording paper, 11...recording paper,
12...Platen roller, 13...Thermal head, 14...Ink sheet, 15...Cutter, 16...
...Discharge roller, 17...Ink sheet supply roll,
18... Ink sheet winding roll, 19... Ink sheet sensor, 20... Ink sheet presence/absence sensor, 2
1... Spring, 22... Recording paper presence/absence sensor, 2
4... Recording paper conveyance motor, 25... Ink sheet conveyance motor, 35, 48.49... Driver circuit,
36... Drive circuit, 39... Paper ejection motor, 100
...Reading section, ]01... Control section, 102... Recording section, 103... Operation section, 104... Display section, 105
...Power supply, 106...Modem, 10'7...N
cU, 110... Line memory, 111... Encoding/decoding unit, 112... Buffer memory, 113...
CPU, 11.4・ROM, 115...RAM, 1
32...Heating resistor (heating element), 200... Current control circuit.

Claims (3)

[Claims] (1) A thermal transfer recording device that transfers ink from an ink sheet to a recording medium to record an image on the recording medium, the apparatus comprising: an ink sheet conveying means for conveying the ink sheet; and a recording medium for conveying the recording medium. a medium conveyance means; a recording means for recording an image on the recording medium by acting on the ink sheet; a counting means for counting the number of black pixels recorded by the recording means; A thermal transfer recording apparatus comprising: a control means for controlling the conveyance force of the recording medium conveyance means. (2) When the control means determines that the number of black pixels recorded by the recording means is greater than or equal to a predetermined number, the control means controls the conveyance force of the recording medium conveyance means in a larger direction. The thermal transfer recording device according to item 1. (3) When the recording means transfers one line of data to the shift register provided in the thermal head,
2. The thermal transfer recording apparatus according to claim 1, further comprising a step of counting the number of dots (bits) that are ".".